The similarity lies in the fact that in both cases, gas exchange occurs through the walls of the capillaries due to diffusion. The difference lies in the fact that during gas exchange in tissues, hemoglobin gives oxygen to cells, takes carbon dioxide, and the blood becomes venous, and the reverse process takes place in the lungs – carbon dioxide from the venous blood through the walls of the alveoli enters the respiratory tract and the external environment, and oxygen in the same way it enters the blood, which becomes arterial and enters into a connection with hemoglobin.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.